Restore `turtle` and `bench`
Restore `turtle` and `bench`

`turtle` now builds against the latest version of `doctest`

This also unblocks `bench`
Daniel-Diaz/stackage,asr/stackage,massysett/stackage,ethercrow/stackage,spencerjanssen/stackage,michalkonecny/stackage,Shimuuar/stackage,iand675/stackage,jonschoning/stackage,lwm/stackage,athanclark/stackage,fimad/stackage,peti/stackage,fpco/stackage,soenkehahn/stackage,int-index/stackage,creichert/stackage,stackbuilders/stackage,mgajda/stackage,wereHamster/stackage,simonmichael/stackage,mstksg/stackage,mrkkrp/stackage,clinty/stackage